Those lists are always so subjective, even if they go by ratings. I have a problem with some of them being too modern of a story for what I'd consider a western. Examples: Hud, No Country for Old Men, Brokeback Mountain (which I still refuse to see), Bad Day at Black Rock.
John Wayne and Clint Eastwood certainly are well-represented! I'd have to look it over again and think about it to see if any of my favorites are missing. Noticed that Barbarosa is at #100. I'd always assumed I'd seen it but when it came on the other day I watched it and it was actually the first time. I thought the acting was quite good!
Okay, I see right off that True Grit is missing.